Map Visuals, or Geomaps
A geomap of a country, continent, or region superimposes measurement values onto a geographic map.
Arcadia Enterprise has two basic geomap representation options:
- A filled or choropleth map (Greek χώρο for area or region and πλήθος for multitude) shows geographical areas that are shaded in proportion to the value of the measurement that is displayed on the map.
Consider the following when building choropleth maps:
- Use choropleth maps when your data are attached to enumeration units, such as counties, countries, zipcodes, and so on.
- Standardize data to show rates and ratios instead of raw data counts. For example, instead of plotting gross GDP, plot GDP per Capita.
- Use choropleth maps when you have data with continuous statistical surface. For example, Population is a count and representing it in colored map may be misleading. Population density is a ratio with a continuous statistical surface (even where
0 represents unpopulated areas); so it can be used in choropleth maps.
- A geomap with symbols or marks, such as bubbles, superimposes these symbols onto a geographical map. By default, the area of the marks corresponds to the relative size of the measurement.
Arcadia supports the following geographical specifications by automatically recognizing them as qualified GEO dimensions inside the dataset:
- county, for United States only
- zipcode, for United States only
- longitude and latitude
- DMA, for Nielsen Designated Market Area Regions in United States
If the relevant field in your dataset is not named correctly, be sure to adjust it using the Change Type Geo Option, described in Change Type.
To build the two types of map visuals with specified geographical units, follow the instructions for each option:
Additionally, see the description on how to build a Trellised Map.